Revert "[s3]pidfile_create: use check is_default_dyn_CONFIGFILE() since we have it."

Revert "[s3]pidfile_create: use check is_default_dyn_CONFIGFILE() since we have it."

This reverts commit 1d3dcd1e420104c23769b691d0b8b7958d5c58a7.

This fixes Bug #6531 (Pid File creation.)

Usually, I would extend is_default_dyn_XYZ() so that it returns true
when dyn_XYZ has not been set yet or when its value is equal to the
compiled in default value XZY. But this would have a change in effect
in popt_common and torture.c: is_default_dyn_CONFIGFILE() is used
there to check whether the config file should be overwritten by the
contents of the environment variable SMB_CONF_PATH. Currently this
is only done when set_dyn_CONFIGFILE() had _not_ previously been called
at all, not even with the same value as the compiled in default.

Michael